clk: vc5: Abort clock configuration without upstream clock

In case the upstream clock are not set, which can happen in case the
VC5 has no valid upstream clock, the $src variable is used uninited
by regmap_update_bits(). Check for this condition and return -EINVAL
in such case.

Note that in case the VC5 has no valid upstream clock, the VC5 can
not operate correctly. That is a hardware property of the VC5. The
internal oscilator present in some VC5 models is also considered
upstream clock.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Alexey Firago <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
[[email protected]: Added comment about probe preventing this from
happening in the first place]
Signed-off-by: Stephen Boyd <[email protected]>

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